JPH11343679A - Heat insulating material and its using method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the working property by covering at least both sides of an inorganic fiber heat insulator with a moisture-permeable waterproof sheet. SOLUTION: An inorganic fiber heat insulator 2 is sealed in a bag made of a moisture-permeable waterproof sheet 3 comprising a porous film 4 and a permeable mesh matter 4 consisting of thermoplastic resin laminated on at least one side thereof to constitute a heat insulating material 6. Since the sheet 3 is hardly permeable of water drop but permeable of moisture, and passes the interior side steam leaked to a wall body to the outside, dew condensation in the wall body can be prevented. Further, since the heat insulator 2 is sealed in the bag made of the sheet 3, the inorganic fiber is never scattered, and no uncomfortable feeling is given to a worker. When the heat insulating material 6 is put in an airtight plastic bag, and degassed to reduce the thickness, the storage and transportation are facilitated. Although the heat insulating material 6 sucks air when taken out from the airtight bag in construction, the compressed body is held since the form is gradually restored, and the setting work is facilitated. Accordingly, the construction can be easily performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating material used for a wall or the like where a temperature difference occurs between the inside and the outside, and a method of using the same.

[0002]

2. Description of the Related Art As a heat insulating structure applied to an outer wall of a building such as a general house, a heat insulating material is filled in a space between an exterior material disposed outside and an interior material disposed inside the room. There is a structure. In such a heat insulating structure, generally, a heat insulating material made of an inorganic fiber heat insulator is often inserted between the frame materials. However, recently, there has been a tendency to increase the airtightness and heat insulation of houses, and the temperature difference between indoor and outdoor areas tends to increase. In order to prevent so-called internal dew condensation, which is a phenomenon in which moisture in the room enters the wall and forms dew, a moisture-proof layer must be provided on the indoor side of the heat insulating layer. For this reason, a completely airtight construction of the moisture-proof layer is desired, but the level of the current general construction technique is still insufficient, and moisture infiltrates into the inside of the wall. Dew condensation generated inside the heat insulating material in this way wets a heat insulating material such as glass wool having high water absorption, and reduces the heat insulating effect. As the amount of dew increases, the moisture can travel down the fibers of the insulation and wet the structural and interior materials, causing the building to decay. Therefore, it is necessary to promptly release the moisture to the outside so that the moisture entering the wall body does not dew and accumulate inside the heat insulating material. For this purpose, it is effective to provide a ventilation layer through which low humidity outside air passes on the outdoor side of the heat insulation layer (vent layer construction method). However, in this case, since the glass wool or the like has a large air permeability, the effect as a heat insulating material is reduced by the cool air passing through the ventilation layer. So, between the heat insulation layer and the ventilation layer,
It is important to prevent rain and wind from the outside and guide the moisture leaking from the room to the ventilation layer without disturbing it,
A heat insulating structure in which a moisture-permeable waterproof sheet is provided between a heat insulating material and an exterior material has been implemented.

[0003] In the construction of such a moisture-permeable waterproof sheet, in the case of a wooden house by a conventional construction method, after inserting a heat insulating material such as glass wool into a wooden framework, it is usually wound in a roll shape on the outside thereof. A method is used in which the wet waterproof sheet is fixed to the base, pillar, stud, etc. with a tucker while pulling it so that it does not sag or loosen. The simplification has been desired.

[0004] In recent years, the construction of houses has been industrialized, and prefabricated houses in which floor panels, wall panels, roof panels, and the like prepared in advance are assembled and constructed have become widespread. As an outer wall panel used in such a prefabricated house, a vertical core material and a horizontal core material are assembled into a rectangular frame shape, and a reinforcing core material is vertically and horizontally assembled inside the rectangular frame to form a frame. After filling with a heat insulating material such as glass wool, a plywood face material is adhered to the front and back surfaces of the frame body. Various studies have been made on an outer wall panel containing such a heat insulating material, in which a moisture-permeable waterproof sheet is incorporated in advance. FIG. 12 is an exploded perspective view showing a process of manufacturing an outer wall panel according to a conventional method. That is, the outer wall panel 7a filled with the heat insulating material and the moisture permeable waterproof sheet 3 attached to the wooden frame 23 with an adhesive (arrow a) are assembled (arrow b), but a complicated work process is required. A simple method of installing the moisture-permeable waterproof sheet 3 is desired.

[0005] In addition to the problem of the complicated work of installing the moisture-permeable waterproof sheet, the heat-insulating material itself gives a discomfort accompanied by a tingling stimulus to the operator in the case of the heat-insulating material in which the inorganic fibers are exposed. There is a problem that the heat insulating material is easily deteriorated due to dew condensation. Therefore, it is often configured as a film-coated heat insulating material coated with a thermoplastic resin film such as polyethylene. However, the film-coated heat insulating material coated with a thermoplastic resin film such as polyethylene having no moisture permeability in this manner must provide slits or air vent holes in at least the outdoor film to release moisture to the outside, The scattering of inorganic fibers from these slits and air vent holes cannot be prevented.

As another form of the conventional film-coated heat insulating material and a method of using the same, for example, inorganic fibers are packaged in a film-shaped packaging bag having a predetermined airtightness, and the inside of the packaging bag is evacuated. Some are sealed and the thickness of the heat insulating material is reduced. In such a heat insulating material, when the heat insulating material is used, the packaging bag is opened or a part of the packaging bag is pierced so that air is sucked into the bag and the inorganic fibers are restored along the shape of the packaging bag. However, even in this case, when the heat insulating material is used, the inorganic fibers scatter from the opening or the perforated portion, and the problem that the scattered inorganic fibers are sucked by the installer, and the scattered inorganic fibers are caused by the face, neck, and arms of the installer. There have been problems such as discomfort and pain caused by sticking or sticking to the device.

Further, there is a problem that the heat insulating material made of bulky inorganic fibers is very difficult to install. Insulation materials are usually stored and transported in compressed packaging from the perspective of reducing logistics costs, and when used, air is allowed to flow in and restored to their original shape.However, when installed, it is easier to compress them than to restore their shape. Work can be done. Therefore, it is desirable that the installation work can be completed as much as possible during the compression state. However, since the flow of air is too fast with the conventional heat insulating material, the shape recovery time of the inorganic fiber is short, and the shape recovers immediately. The work of installing the materials is very difficult.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and provides a heat insulating material which is easy to install a moisture-permeable waterproof sheet and has excellent handleability and a method of using the same. The purpose is to provide.

[0009]

Means for Solving the Problems The present inventor has conducted intensive studies in order to solve the above-mentioned problems, and as a result, has found that at least one of inorganic fiber heat insulators such as glass wool and rock wool has been used in heat insulation construction methods for general houses and the like. By using a heat insulating material whose back surface is covered with a moisture permeable waterproof sheet, it has been found that the step of providing the moisture permeable waterproof sheet after installing the heat insulating material can be omitted, and the operation can be simplified. Furthermore, by enclosing the inorganic fiber heat insulator in a bag made of a moisture-permeable waterproof sheet having micropores that allow air to pass but do not allow inorganic fibers to pass through, and cover the entire surface of the inorganic fiber heat insulator, It has been found that the heat insulating material can be compressed and air can be flowed in, and the scattering of the inorganic fibers can be prevented without providing an air vent hole or opening which cannot prevent the scattering of the inorganic fibers. In addition, since the micropores of the moisture-permeable waterproof sheet are much smaller than the conventional vent holes and opening holes, the heat-insulated material sealed in the bag of the moisture-permeable waterproof sheet has a slow air intake, Since the restoration is gradual and it is possible to secure a sufficient time for the installation work in a compressed state, the installation work of the heat insulating material is easy. Further, by making the moisture-permeable waterproof sheet a laminate of a porous film and a gas-permeable net, the strength of the porous film can be reinforced, and by using a gas-permeable net having a different aperture ratio. It is also possible to change the flow rate of the air sucked into the inorganic fiber heat insulator.

That is, the first aspect of the present invention relates to a heat insulating material characterized in that at least the front and back surfaces of an inorganic fiber heat insulator are covered with a moisture-permeable waterproof sheet. Also,
A second aspect of the present invention relates to a heat insulating material characterized in that an inorganic fiber heat insulator is sealed in a bag made of a moisture-permeable waterproof sheet. A third aspect of the present invention relates to the heat insulating material according to the first or second aspect of the present invention, wherein the moisture-permeable waterproof sheet comprises a laminate of a porous film and a gas-permeable net. A fourth aspect of the present invention is characterized in that the heat insulating material of the present invention is further inserted into an airtight plastic bag, the inside of the bag is compressed by decompression or pressing, and the shape is restored by taking out the airtight plastic bag at the time of use. The present invention relates to a method of using a heat insulating material.

According to the heat insulating material of the present invention, the front and back surfaces of which are previously covered with a moisture permeable waterproof sheet, there is no need to separately provide a moisture permeable waterproof sheet after installing the heat insulating material as in the prior art. The installation of the wet waterproof sheet can be performed simultaneously. From the viewpoint of simplification of such work, at least the front and back surfaces of the inorganic fiber heat insulator may be covered with the moisture-permeable waterproof sheet as described above. These problems can also be solved by the fact that the fibers are scattered and the tips of the fibers irritate the skin of the operator and cause discomfort, and the inflow of air after compression is inevitably shortened and the shape recovery time is shortened. For this purpose, it is desirable to have a structure in which the entire surface of the inorganic fiber heat insulator is covered by being enclosed in a bag made of a moisture-permeable waterproof sheet.

In the heat insulating material of the present invention in which the inorganic fiber heat insulator is sealed in a bag made of a moisture permeable waterproof sheet, the inorganic fiber heat insulator and the moisture permeable waterproof sheet are not usually bonded, but only the front and back surfaces are covered. When it is necessary to fix the inorganic fiber heat insulator and the moisture-permeable waterproof sheet as described above, it is preferable to partially bond the inorganic fiber heat insulator with an adhesive or the like. By partially bonding, the moisture permeable waterproof sheet can be fixed to the inorganic fiber heat insulator without losing the moisture permeable waterproof effect, and the outflow and inflow of air necessary to compress it during packing and restore it during construction Not hinder.

The inorganic fiber heat insulator used in the present invention is usually a fiber mat such as glass wool or rock wool, and the thickness is selected according to the application and construction. In general, the thickness before compression is about 50 to 100 mm. Use those.

As the moisture-permeable waterproof sheet used for the heat insulating material of the present invention, various types can be mentioned. Typical examples thereof include a nonwoven fabric formed by flash spinning and a porous film having moisture-permeable waterproof properties. A structure reinforced with a breathable reinforcing material is used.

The heat-insulating material of the present invention is not limited in its application area, but a wall portion having a temperature difference between the inside and the outside, such as an outer wall of a building having a high airtightness or a high heat-insulating structure. It is suitably used as a heat insulating material. Applicable places include, for example, an inner wall portion, a ceiling portion, a floor portion, and the like between two rooms having a temperature difference in addition to the outer wall body of the building, and a partition wall of a cabin other than the building.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are cross-sectional views showing one example of the heat insulating material of the present invention. Insulation material 1 shown in FIG.
Is obtained by covering at least the front and back surfaces of the inorganic fiber heat insulator 2 with the moisture-permeable waterproof sheet 3. The heat insulating material 6 shown in FIG.
In the figure, the inorganic fiber heat insulator 2 is sealed in a bag made of the moisture-permeable waterproof sheet 3. The moisture-permeable waterproof sheet 3 is not particularly limited as long as it is generally used as a moisture-permeable waterproof sheet. Preferably, at least one surface of the porous film 4 is a breathable mesh made of a thermoplastic resin as a reinforcing material. What laminated | stacked the thing 5 is used.

FIG. 3 is a partially cutaway perspective view showing an example in which the heat insulating material 6 of the present invention is used for an outer wall panel in a prefabricated house. The outer wall panel 7 includes a frame 8 assembled in a rectangular frame shape, and an exterior material 9 and an interior material 1 attached to both front and back surfaces thereof.
0 is the main frame material. Interior materials 10
A moisture-proof sheet 11 made of polyethylene or the like having very low moisture permeability is provided between the heat-insulating material 6 and the heat-insulating material 6 as a moisture-proof layer for preventing moisture in the room from entering the heat insulating material 6 and forming dew. The moisture-proof sheet 11 is not limited to a polyethylene sheet, and any sheet having moisture-proof properties such as asphalt kraft paper can be used. It is not always necessary to provide the reinforcing core material 8a incorporated in the frame 8 vertically and horizontally, but it is appropriately provided vertically or horizontally as necessary from the viewpoint of panel strength and dimensional accuracy.

The inside of the outer wall panel 7 is filled with a heat insulating material 6 over the entire surface to thermally shield the outside air from the room. Since the entire surface of the heat insulating material 6 is covered with the moisture permeable waterproof sheet 3, the outer wall panel 7
It is not necessary to separately install the moisture permeable waterproof sheet 3 in the manufacturing process, and the moisture permeable waterproof sheet 3 is provided in the wall at the same time as the heat insulating material 6 is filled. Although the moisture-permeable waterproof sheet 3 is hard to allow water droplets to pass through, it has moisture permeability, so that water vapor leaked into the wall inside the room can be effectively passed to the outside. Therefore,
Water vapor does not remain in the wall, and dew condensation can be prevented. In addition, since the inorganic fiber heat insulator 2 is enclosed in the bag of the moisture-permeable waterproof sheet 3, the heat insulating material 6 of the present invention can be used.
When handling, there is no scattering of the inorganic fibers and no discomfort to the handler.

It is preferable that the thickness of the heat insulating material 6 in a state where the shape is completely restored is smaller than the thickness of the frame 8. Thereby, a ventilation layer effective for preventing dew condensation is provided between the heat insulating material 6 and the exterior material 9. Further, in order to secure a ventilation layer, a gap can be maintained between the heat insulating material 6 and the exterior material 9 by a method such as providing a plurality of strips on the outdoor side of the heat insulating material 6. In this way, the outer wall panel 7 filled with the heat insulating material 6 in advance is carried to the house construction site, and the house is constructed by assembling these panels at the construction site.

It is sufficient that the heat insulating material 6 is filled between the interior material 10 and the exterior material 9. In particular, it is not necessary to use fixing means, but a ventilation layer is secured between the heat insulation material 6 and the exterior material 9. In order to do so, it is preferable to be fixed to the interior material 10 side.
The fixing method is not particularly limited. For example, a method of directly fixing the heat insulating material 6 to the interior material 10 side with a tucker, or a method of applying an adhesive to the surface of the heat insulating material 6 on the interior material 10 side and fixing the same. And the like. As one of preferred embodiments in terms of the heat insulating effect and the moisture permeable waterproof effect, as shown in FIG. 4, an ear portion 3a made of the moisture permeable waterproof sheet 3 is formed around the heat insulating material 6, at least at both ends, A method of fixing the heat insulating material 6 to the frame 8 or the reinforcing core 8a with a nail, a tucker, a tape, or the like at the ear portion may be used.
If this method is used, there is no gap in the contact portion between the heat insulating material 6 and the frame 8 or the reinforcing core material 8a, so that it is more efficient. Also, when a plurality of heat insulating materials 6 are filled in the frame 8 having no reinforcing core material 8a, if the ears 3a are present, the ears 3a of the adjacent heat insulating materials 6 are overlapped with each other and taped. By stopping with such as, the gap between the heat insulating materials 6 can be completely eliminated.

The porous film 4 is obtained, for example, by melt-molding a resin composition obtained by blending a particulate filler with a polyolefin-based resin to form an unstretched sheet, and then stretching the sheet. As an example of a specific production method, first, a polyolefin-based resin, a particulate filler and an additive such as a plasticizer, if necessary, are uniformly mixed with a commonly used mixer to form a resin composition, The stretching treatment is performed by a usual inflation molding method or T-die extrusion molding method. Stretching may be performed in one stage or in two or more stages, but preferably the area magnification is in the range of 1.2 to 8. In the porous film 4 thus obtained, fine pores having each particle of the particulate filler as a nucleus are formed over the entire surface of the film by a stretching treatment, and the fine pores are permeable to gas such as water vapor. However, it exhibits the property of preventing the penetration of water in the form of droplets, and exhibits an effect having both moisture permeability and waterproofness. The porous film 4 can be used alone as the moisture permeable waterproof sheet 3, but since it is inferior in strength, it is preferable to use it by laminating it with a reinforcing material having air permeability.
The porous film 4 has a moisture permeability of 500 g-H ₂ O / (m ² · 24 hr)
The above is preferable because when the moisture-permeable waterproof sheet 3 is formed by laminating the breathable mesh 5 as a reinforcing material, water vapor can be satisfactorily transmitted, and the water resistance is 5%.
It is preferable that the thickness be equal to or greater than 00 mm-H2O because good water resistance is exhibited.

The air-permeable mesh 5 laminated on the porous film 4 is not particularly limited as long as it is a reinforcing material having air permeability. For example, (1) the following (a), (b) and (c)
A nonwoven fabric or woven fabric made of a thermoplastic resin obtained by laminating or weaving at least one kind of uniaxially oriented material selected from the following so that the orientation axes intersect, or (2) the following (a)
And a uniaxially oriented body selected from (b). (A) A split web in which the film is stretched uniaxially in the vertical or horizontal direction and split in the stretching direction. (B) A slit web in which a number of slits are formed in the film in the vertical or horizontal direction and then uniaxially stretched in the slit direction. Uniaxially oriented tape

FIG. 5 (A) shows an example of a uniaxially oriented body forming the breathable net 5 used in the present invention, as a split web 12 in which a film is uniaxially stretched vertically and split vertically.
FIG. The split web 12 made of a thermoplastic resin is made of a first thermoplastic resin and a second thermoplastic resin having a melting point lower than that of the first thermoplastic resin, using a multilayer inflation method, a multilayer T-die method, or the like. Of a multilayer film of at least two or more layers produced by extrusion molding in the longitudinal direction (length direction) of 1.1 to 1
5, preferably 3 to 10 and split (split treatment) using a splitter in the same direction in a zigzag manner. As a result, the multilayer film becomes a net-like shape, and is further expanded to a predetermined width to form a mesh-like split web 12. The split web 12 is a uniaxially oriented body having strength in the longitudinal direction over the entire width direction. In the figure, 13 is a trunk fiber and 14 is a branch fiber. FIG.
FIG. 5B is a partially enlarged perspective view of a portion B in FIG.
The split web 12 has a three-layer structure in which a second thermoplastic resin layer 16 is laminated on both surfaces of a first thermoplastic resin layer 15.

FIG. 6 (A) shows another example of the uniaxially oriented body forming the gas permeable mesh 5 used in the present invention, which is a slit web formed by forming a large number of slits in a film and then uniaxially stretching in a lateral direction. FIG. 17 is a partially enlarged perspective view showing 17. The slit web 17 made of a thermoplastic resin is formed by forming intermittent slits in a staggered shape in a lateral direction (width direction), for example, with a hot blade or the like, in a portion excluding both ears of the multilayer film. A uniaxially oriented body stretched in the transverse direction at an elongation ratio of 1.1 to 15, preferably 3 to 10, and having strength in the transverse direction. Preferably, the multilayer film is finely oriented by about 1.1 to 3 times in the longitudinal direction by rolling or the like, and then subjected to slit processing in a staggered manner in the horizontal direction with a hot blade, followed by transverse stretching. FIG. 6B is a partially enlarged perspective view of a portion B in FIG. 6A, and the slit web 17 has a second thermoplastic resin layer 16 laminated on both surfaces of the first thermoplastic resin layer 15. 3
It has a layer structure.

FIG. 7 is a partially enlarged perspective view showing a uniaxially oriented tape as another example of the uniaxially oriented body. The uniaxially oriented tape 18 made of a thermoplastic resin is made of a first thermoplastic resin and a second thermoplastic resin having a melting point lower than that of the first thermoplastic resin, using a multilayer inflation method or a multilayer T-die method. Before and / or after cutting at least two or more layers of a multilayer film produced by extrusion molding, elongation ratios of 1.1 to 15 in the longitudinal and / or transverse directions,
Preferably, it is uniaxially oriented to 3 to 10 and cut to obtain a multilayer stretched tape. The uniaxially oriented tape 18 also has a three-layer structure in which the second thermoplastic resin layer 16 is laminated on both surfaces of the first thermoplastic resin layer 15 as described above.

FIGS. 8 to 10 show specific examples of the nonwoven fabric or woven fabric forming the breathable net 5 used in the present invention. FIG. 8 shows a nonwoven fabric 19 obtained by laminating a split web 12 in a weft manner.
3 is a partial plan view of FIG. FIG. 9 is a partial plan view of a nonwoven fabric 20 in which two sets of uniaxially oriented tapes 18 are arranged in parallel, and FIG. 10 is a partial perspective view of a woven fabric 21 in which the uniaxially oriented tapes 18 are woven. As a specific example of the nonwoven fabric 19, “Nisseki Warif” (trade name, Nisseki Plast Co., Ltd.)
Manufactured).

The bonding between the porous film 4 and the gas permeable mesh 5 may be performed by using an adhesive or by thermocompression bonding without using an adhesive. As the moisture-permeable waterproof sheet 3, a porous film 4 in which one side or both sides of the porous film 4 are laminated with a breathable mesh 5 as a reinforcing material is used, but usually sufficient lamination is obtained by laminating only one side.

As another example of the air-permeable net 5, a long-fiber non-woven fabric spun from a thermoplastic resin can be used.
When a long-fiber nonwoven fabric is used as a reinforcing material, a stretched one is usually used. For example, an undrawn long-fiber nonwoven fabric is stretched in one direction, and a stretched unidirectionally arranged nonwoven fabric consisting of at least one layer in which fibers of the nonwoven fabric are arranged in almost one direction, or laminated so that their arrangement axes intersect. Stretched cross-laminated nonwoven fabric is used.

As a means for spinning the long-fiber nonwoven fabric spun from the thermoplastic resin, a conventional spinning device such as a melt blow die type or a spun bond type can be used. The spinning means described in Japanese Patent Application Laid-Open No. 2-269859 (fluid rectification method) can also be used.
The point that the above-mentioned spinning means is fundamentally different from the conventional spunbond type spinning is that the spinning means is heated by infrared heating or hot air immediately after spinning from the nozzle, or is taken up by using hot air as air for air sucker. For example, it is intended to actively control the molecular orientation of the fiber during spinning and take it up.

The stretched unidirectionally arranged nonwoven fabric is a nonwoven fabric in which the long-fiber nonwoven fabric is stretched in one direction as described above, and the stretched long fibers are arranged in one direction as a whole,
The drawn long fibers have substantially molecular orientation.
As the stretching means, there can be used a longitudinal stretching means, a transverse stretching means and a biaxial stretching means used for stretching a conventional film or nonwoven fabric, and various types such as those shown in JP-B-3-36948 can be used. Stretching means can also be used.

The stretched unidirectionally aligned nonwoven fabric can be used alone or
It can also be used by laminating without intersecting the arrangement axes of the layers or more, but it can also be used in the form of a stretched cross-laminated nonwoven fabric laminated so that the arrangement axes of two or more layers intersect. Many are orthogonal nonwoven fabrics in which a vertical arrangement layer and a horizontal arrangement layer are laminated and bonded, but there is no particular limitation as long as the fibers are laminated so that the arrangement axes of the fibers intersect.

The long-fiber nonwoven fabric can be used as the moisture-permeable waterproof sheet 3 in a single-layer structure without being laminated with the porous film 4. In this case, the long-fiber nonwoven fabric may be unstretched, but is preferably stretched in view of strength and cost.

In addition to the long-fiber nonwoven fabric, as the moisture-permeable waterproof sheet 3 used in a single-layer structure, a nonwoven fabric “Tyvek” (trade name, manufactured by thermocompression bonding of three-dimensional mesh fibers of asphalt-impregnated paper or high-density polyethylene) is used. Du Pont) can also be used.

In handling the heat insulating material, from the viewpoint of reducing distribution costs, storage and transportation are usually performed in a state where the volume is reduced by compression. FIG. 11 is a cross-sectional view showing an example of a state where the heat insulating material 6 of the present invention is compressed.
In FIG. 11, the heat insulating material 6 in which the inorganic fiber heat insulator 2 is sealed in a bag made of the moisture-permeable waterproof sheet 3 is further inserted into the airtight plastic bag 22, and the air in the airtight plastic bag 22 is decompressed or reduced. After reducing the thickness by pressing and extracting, it was sealed by a method such as heat fusion. By compressing in this manner, the airtight plastic bag 2
Since the thickness of the heat insulating material 6 stored in 2 can be reduced to about 1/10, the effect of volume reduction in storage and transportation is great. As the airtight plastic bag 22, for example, a plastic bag such as polyethylene, polypropylene, polyester, or polyvinylidene chloride can be used.

As a method of using the heat-insulating material 6 thus compressed, the heat-insulating material 6 is carried to a construction site in a state where the heat-insulating material 6 is housed in the air-tight plastic bag 22, and is taken out of the air-tight plastic bag 22 and used at the stage of use. . At the time of taking out from the airtight plastic bag 22, air flows into the inorganic fiber heat insulator 2 of the heat insulating material 6 and restoration of the shape starts, but since the air suction port of the moisture permeable waterproof sheet 3 is a fine hole, Air is gradually inhaled through the micropores.
Therefore, since the heat insulating material 6 gradually restores its shape over time, the work can be performed while maintaining a compressed state that facilitates the installation work.

As described above, the shape restoration time of the heat insulating material 6 is:
This can be changed by changing the flow rate of the air that passes through the moisture-permeable waterproof sheet 3 and is sucked into the inorganic fiber heat insulator 2. In the present invention, when a laminate of the porous film 4 and the gas permeable mesh 5 is used as the moisture permeable waterproof sheet 3, the shape restoration time can be easily reduced by using the gas permeable mesh 5 having a different aperture ratio. It is possible to change That is, when the shape restoration time of the heat insulating material 6 is desired to be longer, the opening ratio of the gas permeable mesh 5 is reduced to increase the ratio of the fine pores of the porous film 4 to be closed, thereby reducing the air flow. Allow the inflow to take place gradually. Conversely, when it is desired to quickly restore the shape, the aperture ratio may be increased. However, when the heat insulating material 6 is installed, the work can be performed more easily in the compressed state. It is preferable that the restoration is slow. However, if the aperture ratio is too small, the moisture permeability is impaired. Therefore, the aperture ratio is appropriately selected in consideration of work time, moisture permeability, and the like.

[0037]

By using the heat insulating material of the present invention, the installation of the moisture permeable waterproof sheet in the heat insulating method can be facilitated, which can greatly contribute to the simplification of the work. In addition, when the inorganic fiber heat insulator is sealed in a bag made of a moisture-permeable waterproof sheet, the inorganic fiber can be prevented from scattering, and the shape recovery after compression is gradual, so that the compression is performed during the time required for installation. The state can be sufficiently ensured, and the work of installing the heat insulating material can be easily performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a heat insulating material of the present invention.

FIG. 2 is a sectional view of another example of the heat insulating material of the present invention.

FIG. 3 is a partially cutaway perspective view of an outer wall panel using the heat insulating material of the present invention.

FIG. 4 is a cross-sectional view showing a state in which the heat insulating material of the present invention is fixed to a frame or a reinforcing core at an ear portion.

5 (A) is a partially enlarged perspective view of a split web, and FIG. 5 (B) is a partially enlarged perspective view of a portion B of FIG. 5 (A).

6 (A) is a partially enlarged perspective view of a slit web, and FIG. 6 (B) is a partially enlarged perspective view of a portion B in FIG. 6 (A).

FIG. 7 is a partially enlarged perspective view of a uniaxially oriented tape.

FIG. 8 is a partial plan view of a nonwoven fabric obtained by laminating a split web in a weft manner.

FIG. 9 is a partial plan view of a nonwoven fabric laminated with a uniaxially oriented tape.

FIG. 10 is a partial perspective view of a woven fabric in which a uniaxially oriented tape is woven.

FIG. 11 is a cross-sectional view showing a state where a heat insulating material is inserted into an airtight plastic bag and compressed.

FIG. 12 is an exploded perspective view showing a process of manufacturing an outer wall panel according to a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 6 Heat insulating material 2 Inorganic fiber heat insulator 3 Moisture-permeable waterproof sheet 4 Porous film 5 Air-permeable mesh 7, 7a Outer wall panel 8 Frame 8a Reinforcement core material 9 Exterior material 10 Interior material 11 Moisture-proof sheet 12 Split web 13 Trunk Fiber 14 Branch fiber 15 First thermoplastic resin layer 16 Second thermoplastic resin layer 17 Slit web 18 Uniaxially oriented tape 19, 20 Nonwoven fabric 21 Woven fabric 22 Airtight plastic bag 23 Wooden frame

Claims (4)

[Claims] 1. A heat insulating material characterized in that at least the front and back surfaces of an inorganic fiber heat insulator are covered with a moisture-permeable waterproof sheet. 2. A heat insulating material comprising an inorganic fiber heat insulator sealed in a bag made of a moisture-permeable waterproof sheet. 3. The heat insulating material according to claim 1, wherein the moisture permeable waterproof sheet is formed of a laminate of a porous film and a gas permeable mesh. 4. The heat insulating material according to claim 1 is further inserted into an airtight plastic bag, the inside of the bag is compressed by decompression or pressing, and is taken out of the airtight plastic bag at the time of use to restore its shape. The use of a heat insulating material characterized by the above-mentioned.